[904] | 1 | <!-- ******************************************************** --> |
---|
| 2 | <!-- --> |
---|
| 3 | <!-- [History] --> |
---|
| 4 | <!-- Converted to DocBook: Katsuya Amako, Aug-2006 --> |
---|
| 5 | <!-- Changed by: Gabriele Cosmo, 18-Apr-2005 --> |
---|
| 6 | <!-- --> |
---|
| 7 | <!-- ******************************************************** --> |
---|
| 8 | |
---|
| 9 | |
---|
| 10 | <!-- ******************* Section (Level#2) ****************** --> |
---|
| 11 | <sect2 id="sect.Geom.ConvGeom"> |
---|
| 12 | <title> |
---|
| 13 | Converting Geometries from Geant3.21 |
---|
| 14 | </title> |
---|
| 15 | |
---|
| 16 | <!-- ******************* Section (Level#3) ****************** --> |
---|
| 17 | <sect3 id="sect.Geom.ConvGeom.App"> |
---|
| 18 | <title> |
---|
| 19 | Approach |
---|
| 20 | </title> |
---|
| 21 | |
---|
| 22 | <para> |
---|
| 23 | <emphasis role="bold">G3toG4</emphasis> is the Geant4 facility to convert |
---|
| 24 | GEANT 3.21 geometries into Geant4. This is done in two stages: |
---|
| 25 | |
---|
| 26 | <orderedlist spacing="compact"> |
---|
| 27 | <listitem><para> |
---|
| 28 | The user supplies a GEANT 3.21 RZ-file (.rz) containing the |
---|
| 29 | initialization data structures. An executable <literal>rztog4</literal> reads |
---|
| 30 | this file and produces an ASCII <emphasis>call list</emphasis> file containing |
---|
| 31 | instructions on how to build the geometry. The source code of |
---|
| 32 | <literal>rztog4</literal> is FORTRAN. |
---|
| 33 | </para></listitem> |
---|
| 34 | <listitem><para> |
---|
| 35 | A call list interpreter (<literal>G4BuildGeom.cc</literal>) reads these |
---|
| 36 | instructions and builds the geometry in the user's client code for |
---|
| 37 | Geant4. |
---|
| 38 | </para></listitem> |
---|
| 39 | </orderedlist> |
---|
| 40 | </para> |
---|
| 41 | |
---|
| 42 | </sect3> |
---|
| 43 | |
---|
| 44 | <!-- ******************* Section (Level#3) ****************** --> |
---|
| 45 | <sect3 id="sect.Geom.ConvGeom.Import"> |
---|
| 46 | <title> |
---|
| 47 | Importing converted geometries into Geant4 |
---|
| 48 | </title> |
---|
| 49 | |
---|
| 50 | <para> |
---|
| 51 | Two examples of how to use the call list interpreter are |
---|
| 52 | supplied in the directory <literal>examples/extended/g3tog4</literal>: |
---|
| 53 | |
---|
| 54 | <orderedlist spacing="compact"> |
---|
| 55 | <listitem><para> |
---|
| 56 | <literal>cltog4</literal> is a simple example which simply invokes the |
---|
| 57 | call list interpreter method <literal>G4BuildGeom</literal> from the |
---|
| 58 | <literal>G3toG4DetectorConstruction</literal> class, builds the geometry and |
---|
| 59 | exits. |
---|
| 60 | </para></listitem> |
---|
| 61 | <listitem><para> |
---|
| 62 | <literal>clGeometry</literal>, is more complete and is patterned as for |
---|
| 63 | the novice Geant4 examples. It also invokes the call list |
---|
| 64 | interpreter, but in addition, allows the geometry to be visualized |
---|
| 65 | and particles to be tracked. |
---|
| 66 | </para></listitem> |
---|
| 67 | </orderedlist> |
---|
| 68 | </para> |
---|
| 69 | |
---|
| 70 | <para> |
---|
| 71 | To compile and build the G3toG4 libraries, you need to have set in |
---|
| 72 | your environment the variable <literal>G4LIB_BUILD_G3TOG4</literal> at the |
---|
| 73 | time of installation. The G3toG4 libraries are not built by |
---|
| 74 | default. Then, simply type |
---|
| 75 | |
---|
| 76 | <informalexample> |
---|
| 77 | <programlisting> |
---|
| 78 | gmake |
---|
| 79 | </programlisting> |
---|
| 80 | </informalexample> |
---|
| 81 | |
---|
| 82 | from the top-level <literal>source/g3tog4</literal> directory. |
---|
| 83 | </para> |
---|
| 84 | |
---|
| 85 | <para> |
---|
| 86 | To build the converter executable <literal>rztog4</literal>, simply |
---|
| 87 | type |
---|
| 88 | |
---|
| 89 | <informalexample> |
---|
| 90 | <programlisting> |
---|
| 91 | gmake bin |
---|
| 92 | </programlisting> |
---|
| 93 | </informalexample> |
---|
| 94 | </para> |
---|
| 95 | |
---|
| 96 | <para> |
---|
| 97 | To make everything, simply type: |
---|
| 98 | |
---|
| 99 | <informalexample> |
---|
| 100 | <programlisting> |
---|
| 101 | gmake global |
---|
| 102 | </programlisting> |
---|
| 103 | </informalexample> |
---|
| 104 | </para> |
---|
| 105 | |
---|
| 106 | <para> |
---|
| 107 | To remove all <literal>G3toG4</literal> libraries, executables and .d files, |
---|
| 108 | simply type |
---|
| 109 | |
---|
| 110 | <informalexample> |
---|
| 111 | <programlisting> |
---|
| 112 | gmake clean |
---|
| 113 | </programlisting> |
---|
| 114 | </informalexample> |
---|
| 115 | </para> |
---|
| 116 | |
---|
| 117 | </sect3> |
---|
| 118 | |
---|
| 119 | <!-- ******************* Section (Level#3) ****************** --> |
---|
| 120 | <sect3 id="sect.Geom.ConvGeom.Curr"> |
---|
| 121 | <title> |
---|
| 122 | Current Status |
---|
| 123 | </title> |
---|
| 124 | |
---|
| 125 | <para> |
---|
| 126 | The package has been tested with the geometries from experiments |
---|
| 127 | like: BaBar, CMS, Atlas, Alice, Zeus, L3, and Opal. |
---|
| 128 | </para> |
---|
| 129 | |
---|
| 130 | <para> |
---|
| 131 | Here is a comprehensive list of features supported and not |
---|
| 132 | supported or implemented in the current version of the package: |
---|
| 133 | |
---|
| 134 | <itemizedlist spacing="compact"> |
---|
| 135 | <listitem><para> |
---|
| 136 | Supported shapes: all GEANT 3.21 shapes except for |
---|
| 137 | <literal>GTRA</literal>, <literal>CTUB</literal>. |
---|
| 138 | </para></listitem> |
---|
| 139 | <listitem><para> |
---|
| 140 | <literal>PGON</literal>, <literal>PCON</literal> are built using the |
---|
| 141 | <emphasis>specific</emphasis> solids <literal>G4Polycone</literal> and |
---|
| 142 | <literal>G4Polyhedra</literal>. |
---|
| 143 | </para></listitem> |
---|
| 144 | <listitem><para> |
---|
| 145 | GEANT 3.21 <literal>MANY</literal> feature is only partially |
---|
| 146 | supported. |
---|
| 147 | <literal>MANY</literal> positions are resolved in the |
---|
| 148 | <literal>G3toG4MANY()</literal> function, which has to be processed before |
---|
| 149 | <literal>G3toG4BuildTree()</literal> (it is not called by default). |
---|
| 150 | In order to resolve <literal>MANY</literal>, the user code has to provide |
---|
| 151 | additional info using <literal>G4gsbool(G4String volName, G4String |
---|
| 152 | manyVolName)</literal> function for all the overlapping volumes. |
---|
| 153 | Daughters of overlapping volumes are then resolved automatically |
---|
| 154 | and should not be specified via <literal>Gsbool</literal>. |
---|
| 155 | <para> |
---|
| 156 | <emphasis role="bold">Limitation</emphasis>: a volume with a |
---|
| 157 | <literal>MANY</literal> position can have |
---|
| 158 | only this one position; if more than one position is needed a new |
---|
| 159 | volume has to be defined (<literal>gsvolu()</literal>) for each |
---|
| 160 | position. |
---|
| 161 | </para> |
---|
| 162 | </para></listitem> |
---|
| 163 | <listitem><para> |
---|
| 164 | <literal>GSDV*</literal> routines for dividing volumes are implemented, |
---|
| 165 | using <literal>G4PVReplica</literal>s, for shapes: |
---|
| 166 | |
---|
| 167 | <itemizedlist spacing="compact"> |
---|
| 168 | <listitem><para> |
---|
| 169 | <literal>BOX</literal>, <literal>TUBE</literal>, |
---|
| 170 | <literal>TUBS</literal>, <literal>PARA</literal> - all axes; |
---|
| 171 | </para></listitem> |
---|
| 172 | <listitem><para> |
---|
| 173 | <literal>CONE</literal>, <literal>CONS</literal> - axes 2, 3; |
---|
| 174 | </para></listitem> |
---|
| 175 | <listitem><para> |
---|
| 176 | <literal>TRD1</literal>, <literal>TRD2</literal>, |
---|
| 177 | <literal>TRAP</literal> - axis 3; |
---|
| 178 | </para></listitem> |
---|
| 179 | <listitem><para> |
---|
| 180 | <literal>PGON</literal>, <literal>PCON</literal> - axis 2; |
---|
| 181 | </para></listitem> |
---|
| 182 | <listitem><para> |
---|
| 183 | <literal>PARA</literal> -axis 1; axis 2,3 for a special case |
---|
| 184 | </para></listitem> |
---|
| 185 | </itemizedlist> |
---|
| 186 | </para></listitem> |
---|
| 187 | <listitem><para> |
---|
| 188 | <literal>GSPOSP</literal> is implemented via individual logical volumes |
---|
| 189 | for each instantiation. |
---|
| 190 | </para></listitem> |
---|
| 191 | <listitem><para> |
---|
| 192 | <literal>GSROTM</literal> is implemented. Reflections of hierachies based |
---|
| 193 | on plain CSG solids are implemented through the <literal>G3Division</literal> |
---|
| 194 | class. |
---|
| 195 | </para></listitem> |
---|
| 196 | <listitem><para> |
---|
| 197 | Hits are not implemented. |
---|
| 198 | </para></listitem> |
---|
| 199 | <listitem><para> |
---|
| 200 | Conversion of GEANT 3.21 magnetic field is currently not |
---|
| 201 | supported. However, the usage of magnetic field has to be turned on. |
---|
| 202 | </para></listitem> |
---|
| 203 | </itemizedlist> |
---|
| 204 | </para> |
---|
| 205 | |
---|
| 206 | |
---|
| 207 | </sect3> |
---|
| 208 | </sect2> |
---|